/* Filename: pg5.cpp
 *
 * Author: Br. David Carlson
 *
 * Date: July 6, 2009
 *
 * Description:  This GDK program draws a smiley face. The one eye blinks.
 * The user can press any key to end the program.
 */
#include "DarkGDK.h"

const DWORD black = dbRGB(0, 0, 0);
const DWORD white = dbRGB(255, 255, 255);

// Function prototypes:
void DrawBall(int x, int y, int r);
void DrawFace(int x, int y, int r);
void Blink(int x, int y, int time);

void DarkGDK()
{
	int CenterX = 319, CenterY = 239;
	int r = 60;

	dbSetWindowTitle("Smiley Face");
	DrawFace(CenterX, CenterY, r);
	dbWait(2000);
	Blink(CenterX, CenterY, 600);

	dbWaitKey();
}

/* Given:  x   the x-coordinate of the center of the ball.
 *         y   the y-coordinate of the center of the ball.
 *         r   the radius of the desired ball.
 * Task:   To draw a filled-in ball with the given center and radius.
 * Return: Nothing.
 */
void DrawBall(int x, int y, int r)
{
	int k;

	for (k = 0; k <=r; k++)
		dbCircle(x, y, k);
}

/* Given:  x   the x-coordinate of the center of the face.
 *         y   the y-coordinate of the center of the face.
 *         r   the radius of the desired face.
 * Task:   To draw a smiley face with the given center and radius.
 * Return: Nothing.
 */
void DrawFace(int x, int y, int r)
{
	dbCircle(x, y, r);                        // Outline of face
	DrawBall(x - 20, y - 15, 3);              // First eye
	DrawBall(x + 20, y - 15, 3);              // Second eye
	DrawBall(x, y, 2);                        // Nose
	dbLine(x - 20, y + 15, x + 20, y + 15);   // Mouth
}

/* Given:   x     the x-coordinate of the center of the face.
 *          y     the y-coordinate of the center of the face.
 *          time  amount of time (in milliseconds) to blink the eye.
 * Assumes: The face (centered at x, y) has already been drawn.
 * Task:    To blink the one eye for the indicated time.
 * Return:  Nothing.
 */
void Blink(int x, int y, int time)
{
	// Erase the ball for the one eye:
	dbInk(black, black);
	DrawBall(x + 20, y - 15, 3);
	// And draw a line for the closed eye:
	dbInk(white, black);
	dbLine(x + 20 - 4, y - 15, x + 20 + 4, y - 15);

	dbWait(time);
	// Erase the line:
	dbInk(black, black);
	dbLine(x + 20 - 4, y - 15, x + 20 + 4, y - 15);
	// Draw the circular eye again:
	dbInk(white, black);
	DrawBall(x + 20, y - 15, 3);
}